There’s only one way to get the exact controller you want: build it yourself. Reader Jason Kramer did just with a custom MIDI control box, built from the Doepfer Pocket Electronic kit. (See the Doepfer link below for a variety of other cool examples):

This is a great illustration of what’s possible with the kits. Want giant knobs? Want a cross-fader at a slight angle for easy, ergonomic thumb operation? Want pushbuttons arranged around your hand rather than in a boring grid? Just hook them up that way. Jason actually started this with a vintage deviation voltmeter, shown below; my only regret was that he couldn’t work that original faceplate in somehow. But the wooden box is terrific.